SG Heritage Dictionary

Drawbore [Noun] Webster's Dictionary 1913

A hole bored through a tenon nearer to the shoulder than the holes through the cheeks are to the edge or abutment against which the shoulder is to rest, so that a pin or bolt, when driven into it, will draw these parts together.

Drawbore [Verb transitive] Webster's Dictionary 1913

1. To make a drawbore in; as, to drawbore a tenon.

2. To enlarge the bore of a gun barrel by drawing, instead of thrusting, a revolving tool through it.